Grinding machine table positioning mechanism



March 24, 1942. H. F. WIDENER ETAL 2,277,028

GRINDING MACHINE-TABLE POSITIQNING MECHANISM I Filed Nov. 17 1941 2sheets-sheet" 3mm H54 M F MDENER 5E UREE TML/sKaw/v March 1942- H. F.WIDENER ETAL 3 GRINDING MACHINE-TABLE POSITIONING MECHANISM ELM FMDENEREEUREETMUSKUV/N tion' of the manually operable traverse wheel 44.

A table positioning and indexing mechanism may comprise a stop dog 44which is adjustably supported by a pair of clamping'bolts 44 and -4| ina T-slot 44 formed in the front edge of the work supporting table II. Astop block 44 is fixedly mounted on the dog 44 and is provided with aplurality of stepped stop abutments 4|, 42,

44 and 44 which are formed and face longitudinally to correspond withthe shouldered portion to .be ground on the work piece II. The stopblock 44 is fastened to the front face of the dog 44 by a pair of screws44 to facilitate removal of the same when desired. A stop block 44 isprovided for each different work piece to be ground and .the steppedfaces thereon are accurately formed and spaced to correspond with thespacings of shouldered portions on the work piece to be ground. It willbe readily apparent from the foregoing disclosure that by changing theblock 44, the mechanism may be readily set up for grinding any desiredshouldered type work piece having aplurality of shouldered portionsthereon to be ground. A visible indicating mechanism which is arrangedto aid in successively positioning the table II in predeterminedgrinding posi- This mechanism may comprise abracket 1 tion. 44 which isfixedly supported on the front of the machine base. The bracket 44 isprovided with two upwardly extending arms 4| and 44 which servepivotally to support a rocking plate 44. The arms 4| and 42 are providedwith a pair of aligned opposed pivot screws 44 and 44, respectively. theinner ends of which are cone shaped (Fig. 2) to mate with conicallyshaped apertures is arranged to engage an actuating plunger 12 of thedial gauge 41. Another arm 14 of the bell crank lever I4 serves toengage the stepped stop abutment surfaces 4|. 42, 44 and 44 of the stopor positioning dogs- 44. The bell crank lever 14 is pivotally supportedby means of a stud 14 which is fixedly supported on the pivotallymounted plate 44. A pair of stop screws 14 and I4 supported in bossesl1- and I4, respectively, formed integrally with the pivotally mountedplate 44 serve to limit therocking' movement of the bell crank lever 14in either direction.

In order to accurately position the table II for grinding successiveshouldered portions on the work piece II, it is desirable to provide asuitable mechanism for successively positioning the arm 14 of the bellcrank lever 14 in operative position relative to stop abutments 4|, 42,44 and 44 of the stop dog '44. .This is preferably accom- -plished by amanually operated, cam actuated mechanism comprising a cam 44 which isfixedly desired and predetermined position to locate the is providedgagement with the surface 44, the plate 44 isarm 14 of the bell crank 14relative to the stop abutments 4|,.42, 44 and 44 of the stop dog 44. Thelocating surfaces of the cam 44 are arranged to engagea surface 44formed on the under side of the pivotally mounted plate 44- In theposition of the parts (Fig. 4), the cam surface 44 is operative toposition the arm 14 in an operative position relative to the stopabutment 4|. After the first shoulder on the work piece ll has beenground to the desired and predetermined extent, the manually operablelever 44 is swung in a counterclockwise direction into the broken lineposition 44a (Fig. 4) to shift the cam 44 so .that cam face 44 engagesthe face 44 on the plate clockwise direction into broken line position441) to position the cam surface 44 in engagement withthe surface 44 onthe pivotally supported plate. This movement serves'to rock the plate sothat the arm 14 of the bell crank lever 14 assumes position 14b (Fig.4), in which position it lies in the path of the stop abutment 44.Similarly, when the lever 44 is again shifted in a counterclockwisedirection into broken line position 440 to position the cam surface 41in enagain rocked in a counterclockwise direction to position the arm 14in position He so that it lies in the path of the stop abutment 44.

The mechanism above described is shown set up for hunting anddetermining the table position as it is moved in a direction toward theright. If desired, the mechanism may be readily set. up in a similarmanner to indicate and determine table positions during its movementtoward .the left. The stud 14 together with the bell crank lever 14supported thereby may be removed from the position shown in Fig. 3 andthe stud 14 inserted in a threaded aperture 44. The stop abutment plate44 may then be interchanged with a ,plate of the proper design. The stopscrew 14 may be shifted into the threaded aperture 44 formed in a boss41 projecting upwardly from the plate 44. The screw 14 in the newposition together with thescrew 14 will limit the rocking movement ofthe bell crank lever when set up to locate the table during a movementtoward the left.

The operation of this improved table .indexing and positioning mechanismwill be readily apparent from the foregoing disclosure. Assuming theparts to have been previously adjusted and the stop abutment plate 44 ofthe proper design for the work piece ll being ground to have been fixedin position on the dog 44 and the dog 44 adjusted to a predeterminedposition along the table II, and assuming the lever 44 is in the fullline position (Fig. 4), the manually operable hand wheel 44 is rotatedto move the table II toward the right. As the table II approaches thedesired and predetermined position, the stop abutment 4| engages the arm14 of the bell crank lever I4 and rocks the bell crank lever '|4 in aclockwise direction (Fig. 3). This movement serves to move the actuatingplunger 12 of the dial indicator 41. The movement of the table II iscontinued until the dial indicator reads zero. namely, until the tableis located precisely in the desired and predetermined position.

into broken line position 88a to swing the plate 63in a counterclockwisedirection (Fig. 4) so as to position the arm 13 of the bell crank lever18 in position 13a. The table H may then be arranged to actuate saidindicator, said lever .being arranged. in" the path of one of said stopsurfaces, and manually operable means sucmoved a further distancetoward'the right until [the stop abutment 52 (Fig. 3) engages the arm 13of the bell crank lever 10 and rocks it to shift the dial indicatorplunger l2 until the dial indicator reads zero, in which position thework piece is precisely positioned for grinding a sec- 0nd shoulderedportion on the workpiece.

After the second shoulder has been ground to the desired extent and thegrinding wheel 26 has been removed to a-rearward or inoperativeposition, the manually operable lever 88 is again moved in acounterclockwise direction into broken line position 881) to furtherswing the plate 83 so that the arm 13 of the bell crank lever assumesposition 73b so that it lies in the path of the stop abutment 53, inwhich position the third shoulder on the work piece may be ground to thedesired and predetermined extent. The manually operable lever 88 maythenbeswung further in a counterclockwise direction into position 880,in which position the cam face 88 positions the rocking or pivotallymounted plate 63 in position so that the arm I3 of the bell crank lever10 assumes position 'l3c and lies in the path of the stop abutment 54for positioning the table in afourth predetermined position for grindinga cessively to positiods'aid member and lever in the path of successivestop'suriaces on said stop 3. In a grindingi'machine having a base and atable slidably mounted thereon, a stop adjustablymounted on one of saidparts having a pin-- rality of sp'aced1stop s'surfaces, an adjustablememberon the'othr of said parts, a dial i'ndicator on said member, alever on said member arranged toactuate said indicator, said lever beingarranged in the-path'of one of said stop surfaces, and means including acam successively to position said member and'lever in the path ofsuccessive stop surfaces'on said stop dog;

4. In a grinding 'machine having a base, a table slidably mountedthereon, an adjustable stop mounted-on one of said parts having aplurality of spaced stepped stop surfaces, a pivotally mounted platen onthe other of said parts, a dial indicator on said platen, a'bell cranklever piv-' 'otally supported on said platen, one arm of said leverbeing. arranged to actuate said dial indicator, the other arm of saidlever being arranged in the path of movement of one of said stopsurfaces, and means to tilt said platen intermittently and successivelyto position said latter arm in the path of successive stop surfaces onsaid-stop dog.

5. In a grinding machine having a base and a reciprocable worksupporting table mounted thereon, an adjustable stop onone of said partshaving a plurality of stepped stop surfaces, a piv- -otally mountedplaten on the other of said fourth shouldered portion on a work piece tothe desired and predetermined extent.

As previously explained, the stop abutment plate 50 may be readilyinterchanged fora plate designed and made for positioning the table togrind any shouldered work piece to position the table II during itsmovement either toward the right or toward the left, depending upon thenature of the work piece to be ground.

It will thus be seen that therehas been provided by this inventionapparatus in which the various objects hereinabove set forth togetherwith many thoroughly practical advantages are successfully achieved. Asmany possible embodiments may be made of the above invention and as manychanges might be made in the embodiment above set forth, it is to beunderstood that all matter hereinbefore set forth or shown in theaccompanying drawings is to be interpreted as illustrative and not in alimiting sense.

We claim:

1. In 'a grinding machine having a base and a table slidably mountedthereon, a stop adjustably mounted on one of said parts havingaplurality of spaced stop surfaces, an adjustable member on th other ofsaid parts, a dial indicator on said member, a lever on said memberarranged to actuate said indicator, said lever being arranged in thepath of one of said stop'surfaces, and means successively to,position'said member and lever in the path of successive stop surfaceson said stop dog.

2. In a grinding machine having a base and a table slidably mountedthereon, a, stop adjustably mounted on one of said parts having aplurality of spaced stop surfaces, an adjustable member on the other ofsaid parts, a dial indicat )l on said member, a lever on said memberparts, a dial indicator on said platen, a bell crank lever pivotallysupported on said platen, one arm of said lever being arranged toactuate said dial indicator, the other arm of said lever being arrangedin the pathof movement of one of said stop surfaces, and means includinga cam to rock said platen successively to position said latter arm ofthe bell crank lever in the path of successive stop surfaces on saiddog.

6. In a grindingmachine having a base and a reciprocable work supportingtable mounted thereon, an adjustable stop on one of said parts having-aplurality of stepped stop surfaces, a

pivotally mounted platen on the other of said platen in one of aplurality of positions, and a manually operable lever to actuate saidcam.

7. In a grinding machine having a base and a reciprocable worksupporting table mounted thereon, an adjustable stop on said tablehaving a plurality of stepped stop-surfaces, a pivotally mounted platenon said base, a dial indicator on said platen, a bell crank leverpivotally supported on said platen, one arm of said lever being arrangedto actuate said dial indicator, the other arm of said lever beingarranged in the path of movement of one of said stopsurfaces, arotatable cam to rock said platen, said cam being shaped to locate saidplaten in one of a plurality of positions, and a manually operable leverto actuate said cam.

H. FRED WIDENER. GEORGE T. MUSKOVIN.

